Can you buy computers with Windows Embedded Standard installed? Ready from a OEM manufacturer? If not, you will never get a OEM-SLP key to that software.
It can be a static key, all Embeded software on my MSDN/Technet account has static keys, but I do not have that key, so I don't know. But it show up on several forums, so i should work then.
just googled it MPMVY-PP762-*****-83RXJ-***** is for "Microsoft Windows Embedded Standard 7 Runtime" although since the key was posted on the internet by the piracy group KOPiE, don't be surprised if Microsoft has blocked it from being activated as for whether the key is private, volume or retail. i've seen some reports that it is an evaluation key that will work for 180 days
But Microsoft operate with a different set of keys for some programs, thats static keys. All that have access to MSDN/Technet get the same key for the same program. So it's not OEM, Retail, volume, or private.